Industrial gas burner



g- 1960 R. E. BUCKHOLDT INDUSTRIAL GAS BURNER Filed April 8, 1957 l5--Etooooooo INVENTOR. ROBERT E. BUCKHOLDT ATTORNEY.

States INDUSTRIAL GAS BURNER Filed Apr. 8, 1957, Ser. No. 651,461

'4 Claims. (Cl. 263-19) The present invention relates to industrial gas burners, and more particularly to such a burner that is adapted to be used in relatively low temperature work.

It is frequently desirable to heat objects in a furnace to a relatively low temperature. When the ordinary type of burner is used for this service it is customary to supply a large excess of air with the fuel in order to reduce flame temperature. Such a mode of operation makes it diflicult to maintain a stable flame. Furthermore, there is always the danger of flame impingement on the work with consequent overheating or localized burning of the work.

It is an object of the invention to provide a burner in which complete and stable combustion of the fuel is insured with provision for tempering hot products of combustion.

atent ice is a chamber 14, as best shown in the drawing. Chamber 14 is provided with a plurality of discharge orifices extending radially around its periphery. A suitable gas is supplied to a central passage 12 of member 8 by a pipe 16, and flows from this passage to chamber 13 and out through orifices 15. Member 8 is provided with a flange 17 that rests against the back of block holder 4, and to which it is fastened by bolts 18. In order to protect the upper surface of disc 13 from the heat,-it is covered by a ceramic disc 19, and the lower portion of member 8, below annular passage 9, is covered by a ceramic sleeve 20. Preferably the disc 19 and sleeve are formed as a single member.

In the operation of the burner a mixture of fuel and air is supplied by pipe 11 to the annular passage 9. This mixture is discharged through the multiplicity of substantially radially directed ports 10 to burn in an annular combustion chamber formed by depression 6 and the space between that depression and the upper surface of refractory disc 19. Since it is intended that a combustible mixture of fuel and air be supplied through the openings 10 It is a further object of the invention to provide a burner which is operative to spread hot products of combustion and a gas heated thereby in a predetermined pattern throughout the interior of a heated enclosure.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, however, its ad vantages and specific objects attained with its use, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and de scribed a preferredernbodirnent of the invention.

In the drawings, the single figure shows theburner in section. I

Referring to the drawing there is shown at 1 a section of a furnace wall in which the burner of the invention is to be placed. This wall is backed up with the usual sheet metal 2 and they are each provided with an opening through which a burner block 3 is inserted. It will be noted that the front face of the block is substantially in the same plane as the front face of the furnace wall. The block 3 is shown by way of example as being held in a metal holder 4 that is fastened by suitable means such as bolts 5 to the metal backing of the furnace. The block is provided on its face with a depression 6 that is cup, or substantially conical, inshape, and is provided with a central opening 7 that extends from the face of the depression to the opposite face of the block. Holder 4 is provided with an opening concentric with the opening 7 in the block.

A tubular member 8 extends through the opening 7 and has one end thereof projecting beyond the face of the burner block. This tubular member is provided with an annular passage 9, the lower end of which has a plurality of radially directed discharge openings 10 formed therein adjacent to the base of the depression. The outer end of passage 9 communicates with a supply pipe 11 through which fuel, generally in the form of a combustible mixture of gas and air, is supplied to be discharged through openings 10. Attached to the lower and projecting end of tubular member 8 and substantially parallel to the face of block 3 is a hollow disc 13, the interior of which to this space, combustion will be completed within the space, so that hot products of combustion at substantially the flame temperature will be discharged through the restricted annular outlet between the face of the burner block and upper surface of disc 19. The refractory surface of the depression 6, the sleeve 20 and disc 19 will become incandescent to help pilot the combustion, thereby insuring that combustion will be completed within this space. Furthermore, this piloting effect due to the incandescent surfaces surrounding the combustion space, will permit a substantially greater quantity of fuel to be burned than would be the case if the space were open.

It is noted that the metallic parts of the tubular member.

8 and disc 13 are protected by the refractory sleeve 20 and disc 19. The metal parts, however, are cooled somewhat by flowing gases. This is particularly true of that portion of the outer wall annular passage 9 that is directly exposed to the combustion space.

A suitable gas is supplied through pipe 16 and passage 12 to be discharged at a relatively high velocity through orifices 15 in a plane substantially parallel to the plane of the furnace wall. The gas discharged through these openings will mix with the combustion gases flowing from the combustion space 6 to temper those gases. The volume of gas flowing through the orifices 15 as well as the volume of fuel burned can be regulated to adjust the temperature of the combustion gases in order to produce a temperature in the furnace chamber which is desired. If the objects being heated in the furnace will not be harmed by the oxidizing effect of air, then air can be introduced through pipe 16. If, however, it is necessary or desirable to maintain a substantially neutral atmosphere in the furnace chamber, recirculated products of combustion withdrawn from the furnace chamber can be reintroduced thereto through pipe 16 and the orifices 15, or any other suitable atmosphere can be used. The furnace temperature can be varied through a range of from about 400 to 1300 F. by varying the volume of fuel mixture and the volume of gas supplied to pipe 16.

Since only a combustible mixture is introduced into the combustion space 6, the fuel will always be burned efficiently. There is no question of diluting the fuel supply to such an extent that an unstable flame is produced. Thus the gases discharged from the combustion space will be at the high temperature obtained with a stoichiometric mixture regardless of the volume of fuel. It is only necessary to supply enough fuel to prevent back-fire through the passages 10. Since those passages are radially directed and are relatively small, back-firing will not occur easily. The hot products of combustion, which are substantially at flame temperature, can be diluted in any amount and manner desired by varying the volume and composition of the gas which is mixed with the products of combustion. The tempered products of combustion can be used to heat the furnace to relatively low temperatures without any danger of flame impingement on the workandwithout any danger of the flame being extinguished because of the. large volume of tempering gas that is required. It is noted that disc 15 and its protecting refractory disc 19 are larger in diameter than the diameter of the depression 6. Therefore, the high radiant heat that is produced in this area cannot be directed into the furnacechamber proper.

It will be seen from the above description, that I have provided a burner in which efficient combustion takes place at all. rates of fuel supply and a burner in which the combustion gas can betempered to the desired degree in order to produce a required furnace temperatur'e.

While inaccordance-withthe provisions of the statutes, I have illustrated and described the best form of embodiment of my invention now known to me, it will be apparent to those skilled-in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit and scope of the invention set forth in the appended claims, and that in some cases certain features of my invention may be used to advantage without a corresponding use of other features.

What is-claimed-ist' 1. In a burner, the combinationv of a burner block having one surface thereof adapted to act as a portion of a furnacewallr a tubular member extending through said block and' extendingin front of said surface, a hollow disc attached to the projecting end of said member substantially parallel to said surface said surface being provided with a substantially conical. depression coaxial with saidmember and smaller 'in'diameter than said disc, the space between said disc and surface forming a combustion chamber, means forming a passage in said member terminating in a plurality'of outlets adjacent to the base of said depression in said combustion chamber between said surface and disc through which fuel and air are supplied to be burned, and means forming a passage in said member. through which gasis supplied to said disc, said disc being provided on its periphery with a plurality of orifices through which said gas isdischarged radially to mix with the products of combustion.

2. In a burner, the combination of a. refractory block having a face adapted to for part of a furnace wall, said face being provided with a cup-shaped depression therein, and said block being provided with an opening extending from the base of the depression through the same, a tubular member having a plurality of passages therein received in said opening and projecting beyond said face, a hollow disc of a diameter at least equal in diameter to the open end of said depression mounted on the projecting end of said member and substantially parallel to said face and spaced therefrom to provide a combustion space, said disc being provided with a plurality of radially directed apertures spaced around. its periphery communicating with the interior thereof, one of said passages having a plurality of discharge. openings terminatingin said depression around the base thereof, another of' said passages communicating with the interior of said disc, means to supply fuel and air to said one of said passages and means to supply a diluting gas to the other of said passages.

3. In a burner, the combination of a burner block having a face provided with a cup shaped depression and an opening extending from said depression to an opposite face of said block, a tubular member having a plurality of passages therein received in said opening concentric with said depression and projecting beyond said face, a hollow disc at least as large in diameter as said depression mounted on the projecting end of said member and substantially parallel to said face, the space between said disc and face forming an annular combustion chamber open at its outer peripheral edge, the interior of said disc communicating with one of said passages, meansforrning a plurality of substantially radially extending orifices around the periphery of said disc, another of said passagesbeing provided with a plurality of substantally radially directed discharge openings terminating between said disc and said face at the inner periphery of said combustion chamber, means to supply a fuel-air mixture to said last mentioned passage to be discharged in said combustion chamber to be burned therein, and means to supply a diluting gas to said one of said passages to flow through said orifices and mingle with the products of combustion discharging outwardly from said burning mixture. 4. The combination of claim 3 including a refractory shield on the side ofsaid disc adjacent to said face, and a refractory shield around the projecting end of said member.

References Cited in the file of this patent UNITED STATES PATENTS 1,754,603 Brown Apr. 15., 1930 2,389,027 Corbin et al. Nov; 13, 1 945 2,609,866 Wright Sept. 9, 1952 LA i 

